202309138 has 4 divisors (see below), whose sum is σ = 303463710. Its totient is φ = 101154568.

The previous prime is 202309111. The next prime is 202309139. The reversal of 202309138 is 831903202.

202309138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 190633249 + 11675889 = 13807^2 + 3417^2 .

It is not an unprimeable number, because it can be changed into a prime (202309139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50577283 + ... + 50577286.

Almost surely, 2^202309138 is an apocalyptic number.

202309138 is a deficient number, since it is larger than the sum of its proper divisors (101154572).

202309138 is a wasteful number, since it uses less digits than its factorization.

202309138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101154571.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 202309138 is about 14223.5416827174. The cubic root of 202309138 is about 587.0455944857.

The spelling of 202309138 in words is "two hundred two million, three hundred nine thousand, one hundred thirty-eight".